How about to be able to specify the location of the backup folder. For instance, I would like to have like this:
/sdcard/Backups/QtADB
instead of that:
/sdcard/QtADB/backup
A simple "set path" in the settings should be sufficient.

When file is copied/deleted from and to the device a pop-up is displayed to confirm the operation. It would be nice to have an icon on the pop-up to show direction in which file is to be copied, or where from it is to be deleted.